Dozens of President Trump's top aides are reportedly working with temporary security clearances.

Former staff secretary Rob Porter is far from the only member of the Trump administration to handle sensitive government information despite the fact that he had not been granted full security clearance.

The matter of security clearances at the Trump White House has been a recurring issue and was again thrust into the spotlight when Porter on Wednesday resigned amid allegations that he verbally and physically abused his two ex-wives. The accusations against him reportedly contributed to the delay in granting him the security clearance typical for an official at his level.

Porter, who has denied the allegations against him, was among dozens of White House employees still waiting for such clearances, many of them working with temporary approvals while they continue to be investigated by the FBI, officials close to the matter told the Washington Post.

But it's not an issue unique to the Trump administration — The U.S. Government Accountability Office added the security clearance system to its list of “high risk” federal areas requiring reform. Its backlog totaled more than 700,000 cases as of September 2017.

Here’s a look at few high-profile members of the Trump team who have struggled to maintain the appropriate clearance:

Robert Porter

White House chief of staff John Kelly walks with Rob Porter, who resigned as White House staff secretary Wednesday.

(JONATHAN ERNST/REUTERS)

While White House staff secretary might seem like a lower-profile role, the employee works closely with the President and is responsible for the flow of paperwork as it makes its way through the West Wing and into the Oval Office.

Porter’s lack of permanent clearance while performing such duties has sparked backlash from Democrats on Capitol Hill, several of whom have called for an investigation into the security clearance process.

Porter in September was interviewed by the FBI, where he was questioned about the alleged domestic abuse incidents, according to the Post. Following a series of delays, Porter reportedly asked his second wife, Jennifer Willoughby, whether she gave investigators details on their relationship.

Several White House aides recently told Politico that White House chief of staff John Kelly had been aware for weeks that the bureau would deny Porter full clearance. While he initially defended Porter when the abuse allegations emerged, Kelly later said he was “shocked” by the accusations.

Jared Kushner

Despite his status, Jared Kushner is among the dozens of White House employees still waiting for permanent clearance.

(BRENDAN SMIALOWSKI/AFP/Getty Images)

Trump’s son-in-law is among the highest-profile members of the President’s inner-circle still working on a temporary clearance.

Like Porter, Kushner has yet to be granted the clearance — but he has not been denied, either.

The President’s senior adviser has repeatedly revised and amended documents required in applying for security clearance. He’s faced a torrent of backlash from Dems — and several Republicans — for updating his list of foreign contacts with an additional 100 names.

As investigators continue to dig into his background, Kushner is also facing a separate probe into the campaign’s possible Russian collusion during the 2016 election.

Sebastian Gorka

A charge for carrying a weapon at an airport reportedly cost Sebastian Gorka his security clearance and his job.

(Mark Wilson/Getty Images)

The British-born former White House adviser reportedly learned that his security clearances had been revoked while he was on a summer vacation. He was previously charged for carrying a weapon at the Ronald Reagan Washington National Airport.

The lack of credentials made it impossible for Gorka – who resigned in August – to fulfill his White House duties.

Michael Flynn

While Michael Flynn held his position for less than a month, his lack of clearance has proven to be an enduring White House controversy.

(Chip Somodevilla/Getty Images)

While the former national security adviser held his position for less than a month, his lack of clearance has proven to be an enduring White House controversy.

Flynn first earned security clearance while serving as director of the Defense Intelligence Agency for the Obama administration. His clearance was most recently renewed in 2016.

Lawmakers have since accused the controversial former aide for failing to disclose a trip he took to the Middle East in 2015 as well as failing to report his contacts with Israeli and Egyptian officials.

Because security clearance process requires all meetings with foreign officials — within seven years — to be listed, many called his credentials into question.